<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
    <title>Document</title>
    <style>
      div {
        width: 1707px;
        height: 1000px;
        background-color: aliceblue;
        header {
          width: 100%;
          height: 50px;
          background-color: burlywood;
          nav {
            width: 500px;
            height: 30px;
            background-color: pink;
          }
        }
        main {
          width: 100%;
          height: 450px;
          background-color: yellow;

          section {
            width: 600px;
            height: 450px;
            background-color: palevioletred;
            .aside1 {
              width: 100px;
              height: 450px;
              background-color: thistle;
            }
            article {
              width: 100px;
              height: 100px;
              background-color: deeppink;
            }
            .aside2 {
              width: 100%;
              height: 100px;
              background-color: thistle;
            }
          }
        }
        footer {
          width: 100%;
          height: 50px;
          background-color: chocolate;
        }
      }
    </style>
  </head>
  <body>
    <div>
      <header>
        <nav>导航</nav>
      </header>
      <main>
        <section>
          <aside class="aside1">侧边栏</aside>
          <article>内容</article>
          <aside class="aside2">底部</aside>
        </section>
      </main>
      <footer>页脚</footer>
    </div>
  </body>
</html>
